Author(s)

Zhou Zheng

Corresponding Author

Zhou Zheng

ABSTRACT

The successful launch, continuous flight, subsequent circling, landing and patrol of Tianwen-1 Mars probe show that deep space exploration is one of the most challenging fields of high technology in the world today. Problem one:Because the landing process of the detector is constantly changing, the landing process is firstly simplified into three stages for research. Secondly, the stress analysis of the three stages is carried out and the corresponding dynamic equations are established, and the nonlinear programming model is established. At last, the shortest landing time of the detector is 41.7426s through Matlab solution. Problem two:It is determined that the power deceleration stage is the main stage of fuel consumption, and the force analysis of this stage is carried out. The corresponding dynamic equations are established and the equations based on the law of conservation of energy are written. Taking energy as the objective function, energy conservation and kinematics equation as constraints, the nonlinear programming model is adopted, and finally, the minimum fuel consumed by the detector in the EDL process is m0=0.0272kg through Matlab solution. Problem three:Considering the coincidence between the landing process of the detector and the actual situation, the relevant data of the landing process of Tianwen-1 is collected at first. Secondly, the relevant data are fitted by interpolation method, and finally, the movement trend of each stage is solved by Matlab, and then the optimal control scheme is obtained.

KEYWORDS

Edl process, Nonlinear programming model, Energy conservation theorem, Interpolation method